Transcript ARVs in Children - I-TECH

Antiretrovirals in Children
ARV Nurse Training Programme
Marcus McGilvray & Nicola Willis
ARV Nurse Training, Africaid, 2004
Changing Times!
 HIV in children is no longer
considered to be a rapidly fatal
disease
 Now a chronic, manageable
disease with prolonged survival
 Children with vertically acquired
HIV infection are now surviving
into adolescence
ARV Nurse Training, Africaid, 2004
What’s changed?.....
 1996-1997: paediatric
dual ARV therapy
started
 1997-1998: protease
inhibitor-based triple
ARV therapy started
 1998-2003: a dramatic
improvement in the
health of HIV + children
on triple ARV therapy!
ARV Nurse Training, Africaid, 2004
Response in Children…..
Most children treated
with ARVs have
excellent immune
repopulation
HIV
Replication
morbidity and mortality is
significantly reduced
Immune
Response
ARV Nurse Training, Africaid, 2004
But…..
Like adults……..
suppressing the virus
and
preserving the
immune system
…And….
many of these
challenges are
exacerbated in
children!
is associated with
numerous challenges!
ARV Nurse Training, Africaid, 2004
…..not just little adults!
 Children have unique needs
 They are physically, developmentally
and psychologically different to adults
 They should be managed and treated
differently
ARV Nurse Training, Africaid, 2004
CD4 counts
 Infants and children normally
have higher CD4 counts
 As CD4 cell count varies with age,
CD4 percentage is considered a
more reliable marker of
immunological status in children
 An understanding of this is
essential in order to accurately
assess disease progression
ARV Nurse Training, Africaid, 2004
Viral Load
 After starting ARVs, Viral
load may decrease more slowly
in children compared with
adults
 Infants may take longer to
reach an undetectable viral
load
 Only 40% of children may
experience a reduction in Viral
Load to <500copies
ARV Nurse Training, Africaid, 2004
Aim of therapy
To maintain the child’s
immunological status at a
level that prevents
disease progression
ARV Nurse Training, Africaid, 2004
ARV Drug Options
 range of available/licensed drugs for children
compared with adults
e.g. EFV: cannot be used <3 years
 Most of usual NRTIs & NNRTIs are available
e.g. AZT, 3TC, ddI, d4T, NVP
 ? NVP Resistance following exposure
in MTCT programme
ARV Nurse Training, Africaid, 2004
Paediatric Drug Options
 Paediatric formulations not always available
e.g. NFV: only available in tablets
PIs: extremely unpalatable
 ARV syrups more expensive than tablets
 Relatively little research on ARVs & pharmacokinetic
data due to the smaller population of potential
subjects
ARV Nurse Training, Africaid, 2004
Paediatric Doses
 children have different metabolism from adults
 higher doses of ARVS are usually necessary
 drug distribution and metabolism/elimination varies
with growth and development
 Older children: surface area more accurately
reflects drug metabolism and clearance than body
weight (but over estimates doses for infants)
Surface area (m ) = √weight (kg) x height (cm)
3600
ARV Nurse Training, Africaid, 2004
Side Effects
Toxicities are of great
concern and increasingly
problematic for children
and families
….particularly as:
 children’s bodies are
still developing
 children may well be
exposed to these drugs
for much longer than
adults
ARV Nurse Training, Africaid, 2004
Mild side effects
Children commonly experience
side effects
They are often transient
and manageable with
appropriate therapeutic
intervention
 nausea
 vomiting
 diarrhoea
 abdominal
pain
 skin rashes
 headaches
Support and encouragement for
the child and family is
essential
ARV Nurse Training, Africaid, 2004
Severe side effects
Unfortunately, children on ARVs may also
experience worrying long-term side effects
 lipodystrophy
 mitochondrial toxicity (NRTIs)
 bone density changes (PIs)
 lipidaemias with accelerated atherosclerosis (PIs)
 carcinogenicity (NRTIs)
ARV Nurse Training, Africaid, 2004
Monitoring
 Regular blood tests are essential to identify
toxicities and to ensure appropriate
intervention and management
 This presents another challenge:
Few children willingly
give their blood!
ARV Nurse Training, Africaid, 2004
The Ideal ARV!
No toxicities
Good tolerability
Complete viral
suppression
No resistance
ARV Nurse Training, Africaid, 2004
If this ideal were available…..
…ARVs should be started as soon as
a child is diagnosed!
BUT
It is still not clear whether the potential
virological and immunological benefits of
starting therapy early outweigh the problems
with adherence, resistance and toxicity
ARV Nurse Training, Africaid, 2004
So….
….starting ARVs is a balancing act
•Preserve Rx
options
•Psychological impact
•Resistance
•Therapeutic
benefits
•Toxicities
Start?
ARV Nurse Training, Africaid, 2004
NB!
All children differ!
 40-50% of vertically
infected children
survive to 9-10 years
of age without ART
 Some may continue
in to adolescence
before ARVs
indicated
Slow Progressors
V.
Rapid Progressors
ARV Nurse Training, Africaid, 2004
When to Start? (WHO, 2002)
<18 months:
Paediatric Stage III, irrespective of CD4 cell %
Paediatric Stage I or II with CD4 <20%
18+ months:
Paediatric Stage III, irrespective of CD4 cell %
Paediatric Stage I or II with CD4 <15%
ARV Nurse Training, Africaid, 2004
What to Start?
Examples of common ARV regimens given to children
1a
d4T/3TC and Lopinavir/Ritonaivr
(First line if previous exp to NVP within the last 12 mths)
1b
d4T/3TC and NVP
(first line if no previous exposure to NVP in last 12 mths)
1c
d4T/3TC and EFV (if older than 3yrs)
2a
AZT/ddI and Lopinavir/Ritonavir
AZT/ddI and Efavirenz or NVP
2b
ARV Nurse Training, Africaid, 2004
Adherence
Is a HUGE challenge for
adults……
It is even more difficult
with children!
ARV Nurse Training, Africaid, 2004
Medication Factors
All children
dislike medicine!
Difficult
Dietary
requirements
Plenty in
number
to swallow
Taste
bad
But ARVs are difficult
AND
must be taken for life!
Unpleasant
side
effects
ARV Nurse Training, Africaid, 2004
Child/Family Factors
 Child’s lifestyle
Fitting ARVs around school & friends
 Child’s lack of understanding
Why do I need medicine?
 Children are usually reliant on their parent
or carer for ARVS
Is the parent sick/unable to administer ARVs?
Has the parent had any negative experiences of ARVs?
Is the parent adherent?
How is the parent coping with own diagnosis AND child’s?
What is the parent’s perception of the child’s illness?
ARV Nurse Training, Africaid, 2004
Promoting adherence
 Assessment of child & family prior to child commencing
ARVs
 Assist families in developing routine for ARVs. ARVs should
NOT dictate every aspect of daily life
 Open, supportive approach
 Age-appropriate explanations to child re need for
medication
 Continuing support and re-assessment of each child and
family’s situation
 Support from other parents and children
ARV Nurse Training, Africaid, 2004
Promoting adherence
 Trial runs
 Play therapy
 Sticker charts
 Art therapy
 Taking medication with parent
 Support groups
ARV Nurse Training, Africaid, 2004
Remember…..
 ARVs cause great distress,
anxiety and confusion for
children
 It is equally difficult for
parents, who are commonly
under enormous strain with
their own diagnosis and ARVs
 The child and family MUST
be considered as a whole
 They require immense
support and encouragement
ARV Nurse Training, Africaid, 2004